Pop goes this guerrilla campaign

This campaign certainly puts the “G” in guerrilla, since it requires people to put balloons on the tailpipes of cars. Engineered by a German environmental group, the campaign depends on each balloon expanding as the car drives around, inflating the message, “The world can’t take any more CO2,” until the balloon pops. Via Ernie Schenk, where several other people have had fun with the concept.